Noninvasive Diagnosis of Heart Failure With Preserved Ejection Fraction Using the Left Atrioventricular Coupling Index.
BACKGROUND Right heart catheterization is the gold standard for diagnosing heart failure with preserved ejection fraction but is invasive and not readily accessible. The left atrioventricular coupling index (LACI), defined as the ratio of left atrial minimal volume to left ventricular end-diastolic volume, has been pro...